Compilare: user.cpp: In function ‘void solve()’: user.cpp:13:19: warning: unused variable ‘xi’ [-Wunused-variable] int i,j,c,L,C,x,y,xi,yi,z,q,m,p; ^ user.cpp:13:22: warning: unused variable ‘yi’ [-Wunused-variable] int i,j,c,L,C,x,y,xi,yi,z,q,m,p; ^ user.cpp: In function ‘int main()’: user.cpp:55:16: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(in); ^ user.cpp:56:17: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(out); ^ user.cpp:57:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:59:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i]); ^